A taxiing aircraft was not clear of the runway when another aircraft began his takeoff roll.

Attributes
ACN	166886
Time
Date	199012
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	166886
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : ground critical incursion : runway non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : rejected takeoff
Consequence	Other
Miss Distance	horizontal : 5000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation Intra Facility Coordination Failure
Situations
ATC Facility	other physical facility

Narrative:

I was working local control. Visibility was RVR 1800'. Tower visibility was 0. Our asde was OTS due to maintenance. This is a continuing problem. I instructed my other local controller to cross my departure runway. He xed, reported his traffic clear, and I rolled my departure. The other local controller then reported his traffic was not off the runway so I stopped my departure. The aircraft said he had rolled approximately 600' down the runway. The basic problem in this occurrence was an erroneous pilot report. However, the underlying problem is the continuing problem of the asde not working at the world's second busiest airport. The equipment is continually being worked on, but maintenance cannot get it to work on a consistent basis causing a definite safety problem.

Original NASA ASRS Text

Title: A TAXIING ACFT WAS NOT CLEAR OF THE RWY WHEN ANOTHER ACFT BEGAN HIS TKOF ROLL.

Narrative: I WAS WORKING LCL CTL. VISIBILITY WAS RVR 1800'. TWR VISIBILITY WAS 0. OUR ASDE WAS OTS DUE TO MAINT. THIS IS A CONTINUING PROB. I INSTRUCTED MY OTHER LCL CTLR TO CROSS MY DEP RWY. HE XED, RPTED HIS TFC CLR, AND I ROLLED MY DEP. THE OTHER LCL CTLR THEN RPTED HIS TFC WAS NOT OFF THE RWY SO I STOPPED MY DEP. THE ACFT SAID HE HAD ROLLED APPROX 600' DOWN THE RWY. THE BASIC PROB IN THIS OCCURRENCE WAS AN ERRONEOUS PLT RPT. HOWEVER, THE UNDERLYING PROB IS THE CONTINUING PROB OF THE ASDE NOT WORKING AT THE WORLD'S SEC BUSIEST ARPT. THE EQUIP IS CONTINUALLY BEING WORKED ON, BUT MAINT CANNOT GET IT TO WORK ON A CONSISTENT BASIS CAUSING A DEFINITE SAFETY PROB.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.